I don't think you will find any switch mode PSU that does not
generate hash when the radio is used with an antenna close by it (or
mounted on it.) I got a SMPS from Maplin here in the UK and I found
that the problem is the hash is on the outer (negative) lead, which
is not connected to mains ground. It gets on to the radio via this,
and from there to the antenna. Two ways I found to reduce it were a)
to ground the radio to a suitable ground such as a central heating
radiator, and b) when splicing on the 817 connector, to wind a great
many turns of the power cord on to a ferrite ring such as is used for
RF breakthrough prevention. But it still isn't as quiet as a
transformer-based PSU.
It's perfect when used with an outdoor antenna, however.
Julian, G4ILO
--- In FT817@y..., John Lewitzky <johnl@P...> wrote:
Hi everyone,
I have one of these and tried it with the 817 but it does seem
to
generate a good amount of RF hash. Has anyone found a 2A wall wart
type
transformer that works with the 817 without the hash ?
Has anyone tried the PS that Universal Radio sells for the 817
73,
John
N3ZQJ
Pres Waterman wrote:
